One can find STPP from various online sources if that's all what's wanted.
Indeed have found adding STPP to modern laundry detergents or soaps far better alternative than most vintage products.
Issues with vintage detergents sold in USA is most are high dilution, best suited to top loaders...
Notice nearly all these dealer adverts mention trade in allowances and or financing terms.
Yes, overall US economy was booming during post war years, but not everyone was flush with cash.
Adjusted for inflation a washing machine selling for $329 in 1955 would equal $3,977.17 in today's money...
Mobile Maid dw shown in final picture was listed by member of AW.org. Not sure if what became of unit but note his was of later vintage than your MM and as such far more modern. Your MM was one of first designs and not everyone is a fan of those impeller dishwashers. MM shown in final image...
As with any vintage appliance from sewing to washing machines (and anything in between) a thing is only worth what someone is willing to pay. Just because similar vintage appliance sold for $$$ in past it does not automatically mean anyone is willing to fork over same or more today.
Have a GE...
Final hammer price for Tide detergent $76 USD.
Maytag advertising memorabilia went for $352 USD.
https://hibid.com/lot/268658151/assorted-advertising-including--9--maytag-washer?ref=catalog
Great find! Thanks for posting!
Years ago posted similar advertising spot from same period with much of the same.
In terms of placement advertisers pay more for front and rear cover among other certain prime areas. Thus, Maytag dealers paid quite a lot to secure that near half back page space...
USA energy regulations state that "normal" cycle (or whatever one used for energy regulation purposes) must have fixed parameters that consumers cannot change. What would be the point of submitting a washer that used 100F degree water for "hot" when consumers could easily override that setting...
Wash cycle is for washing, bleach cycle for bleaching....
When using chlorine bleach commercial laundries long have used first rinse cycle or last wash of a few for that process.
Whitening, stain removal and sanitizing power of chlorine bleach is almost instantaneous. Any stains not removed in...
My vintage Miele has a whole other cycle for Permanent Press that does several fills/drains as dilution rinse before final wash ends. This means one can wash all sorts of synthetics in very warm (120F) or even hot water (140F) to get them really clean, but not worry about creases and such.
Commercial/industrial laundries that wash in hot water at or over 140 degrees F do not rinse in cold water for most part for normal/cottons/linens. Rather it's temps between 100 F to bit higher. Final rinse after two or more may be "cold", but that is likely it.
Cold be it water or air has same...
GE Dryer Timers:
https://hibid.com/lot/268119771/lot-of-two-ge-appliances-we04x24550-dryer-timer?ref=lot-list
Bosch 300 washer (seller has several on offer, not just one shown in link.
https://hibid.com/lot/266457274/bosch-300-series-compact-washer?ref=lot-list
Blomberg ventless dryer...
There's a very good chance that contents have become one large brick inside box.
If one lived closer would gone to preview day (if one was had) to test contents. If shaken box revealed stuff was still powder, then might be temped.